Multiple-spindle drill, tap, and the like.



jl SI MULHPLE smouz DRILL, TAP,,AND THE LIKE.

. Patented Apr. 23,1918.

.2 shuns-sneer 1.

APPLICATION FILED SEPT- I9I6.

JOHN STANLEY STUJLL, O15 CHICAGO, ILLINOIS, ASSTGNOJR, TO'WESTEBN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OT NEW YORK.

MULTIPLE-SPINDEE @RILL, TAP, AND THE LIKE.

naeaneaf To all whom it may concern:

Be it known that T, JOHN STANLEY STULL, a citizen of the United States, residing at (L'hicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Multiple- Spindle Drills, Taps, and the like, of which the following is a full, clear, concise, and exact description, reference being bad to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in multiple spindle drills, taps, and the like.

The objects of the invention are to provide means permitting ready adjustment of the spindles toward and away from'each features thereof.

other and more particularly to permit the drills or taps to be brought very close together to permit drilling or tapping on close centers; to provide means permitting adjustment of the drills longitudinally whereby they may drill holes of equal depth; and to provide a generally improved and simplified construction.

In the accompanying drawings T have illustrated two embodiments of the invention, which will serve to illustrate the novel The invention may be embodied in other forms however.

Figure 1 is a central sectional elevation of one form of invention;

Fig. 2 is a bottom view thereof;

Fig. 3 is a section on the line 3-3 of Fig. 1;

ig. 4 is a central sectional elevation of the second form of invention, the support bein shown in side elevation;

gig. 5 is an end elevation of said device, an

Fig. 6 is a dia ram, on a reduced scale, illustrating the a justment of the device.

The attachment comprises a housing or supporting casing 7 secured by set screws 8 to a split ring 9, the latter being clamped, about the vertlcally movable, but non-rotatable sleeve 10 and supported on the shoulder 11 at the lower end thereof, whereby the housing as a whole is supported by and depends from said sleeve without rotating, although it is moved up and down when said sleeve is raised and lowered by the rack and pinion arrangement constituting part of the usual drill press equipment, not shown herein. The member 12 is retatable within the sleeve 10 and has the Specification of Letters Patent.

leiatented Apr. 23, 191% Application filed September 1, 1916. Serial No. name.

usual enlarged head 13 which rotates against the lower end of said sleeve and transmits the upward thrust thereto. A tapering arbor '14 fits within a central opening in said member and rotates with it.

Said arbor has a shoulder 15 confined be-' tween anti-friction washers 16, 17. A bushing 18 surrounds the lower end of said arbor 14, the latter having an opening which receives a screw-threaded extension 19 on a spindle 20. Said spindle has gear teeth 21 cut therein which mesh with the teeth on the gear 22, the latter being mounted about a stud 23 provided with an anti-friction bushing 24. The stud is secured within the housing by means of its screw-threaded end 25 which is received within arecess 26 and locked against rotation by a set screw 27, access to the latter being had through the opening 28.

A second spindle 29 having gear teeth 30 cut therein is in mesh with the gear 22, whereby said second spindle is driven from said first spindle through the intermediate gear 22, the two spindles rotating in the same direction. Said second spindle is supported in a radial arm 31 which is supported on and which is free to pivot about the stud 23. Said arm is split and may be clamped in any desired radial position by means of a screw 32 (Fig. 2). It may also be moved up and clamped in any desired position, the length of the teeth 30 being suflicient to provide for a sliding engagement with the teeth on the car 22.

The lower end of the housing 7 has a ring 33 secured thereto by screws 34 or. other fastening means, said ring having an integral hub 35 having one side cut away to provide a flat face 36 2). A similar flat face 37 is formed on t e radial arm 31 whereby, when the two faces are in contact, the center lines of the spindles 29 are very close to each other. Each of said spindles has screw-threaded engagement with a drill holder 40, 41, which receives the drills 42, 43 respectively, or taps or other tools.

With the above arrangement it will be seen that the spindle 20 is the driving spindle and in. addition to rotating the, spindle 21 and the drill 42, it drives the second spindle 29, thereby driving also the distance equal to twice the effective radius of the arm 31 to a very small distance ob tained by bringing the faces 36, 37 together. Furthermore, the vertical adjustment of the spindles may be varied relatively, so that both drills begin drilling at the same time, whereby holes of uniform depth may result. This is a very important feature, as one drill is often ground off more than another during successive sharpening operations, or one drill breaks off and must be reground, so that the two drills are of un equal length and would not drill to the same depth unless relative vertical adjustment were provided.

It will be seen that the drills may be adjusted toward or away from each other merely by swinging the arm 31 about the stud 23 and clamping said arm in any radial position, as well as in any desired vertical position. In making this adjustment the relative positions of the drills are changed with respect to the work. Under certainconditions, for example where the work is held in a jig which always bears a fixed relation to the drill-press, it is desirable to maintain said drills also in the same relative positions with respect to said drill press. Such relative positions may be maintained by loosening the studs 8 and clamping ring 9, thereby permitting the "housing as a whole to be partially rotated with respect to its support.

In order to oil the bearings, an oil cup 45 of standard construction is provided which communicates with an annular oil chamber 46 in the housing 7. The flange 15 is thereby oiled. The said oil also feeds downwardly through the duct 47 to the recess 26 and down through the central passageway'48 in the stud 23 to the transverse openings 49 and 50. The bearing for the gear 22 is thereby oiled from the oil duct 49 and the oil from the duct 50 feeds into recess 51 and flows through the duct 52 to the bearing at the lower end of the spindle 29. The upper end of said bearing may be oiled through-.the oil duct 53 formed beneath the removable cap 54 over the ball bear-- ing 55. Oil also feeds from the annular space 46 to the vertical oil duct 56 and flows through the inclined duct 57 to the bearing at the lower end of the spindle 20.

The structure illustrated in Figs. 4 and 5 is adapted more particularly for tapping, although both""of the structures described herein may be used for drilling or tapping if desired. The various parts and -relative arrangement thereof are very similar to those previously described. Said parts are mounted in a housing 60 having a sleeve 61 suitably heldin one end thereof, whereby said sleeve may be rotated'by having the taper ing opening therein fitted over and frictionally engaging a correspondingly tapering rotating arbor. A spindle 62 is rotated by said sleeve 61, said spindle having a square end 63 passing through a square opening in said sleeve and held against removal by a screw 64. Said spindle rotates the gear 65 which in turn rotates the second spindle 66 in the manner described in connection with the first form of invention. Taps 67 are mounted in the ends of said spindles. Said gear rotates about a pin 68, the latter carrying a split arm 69, the purpose and function of which is the same as that previously described.

The housing is provided with an annular rib 70 which fits between a pair of clamping arms 71 constituting an extension on a bar 72. The upper end of said bar is split, whereby said arms may be clamped against said flange by a screw 73. Said bar is adj ustable vertically in the slide 74, being held in place by a set screw 75. Said slide is guided in ways in a base member 76, the latter being arranged to be clamped to a suitable fixed support by means of set screws or studs 77.

The tapping attachment as a whole may be slid back and forth on the base member 76. The driving arbor is so connected that as the work is pressed against the taps, the

housing recedes and the spindles rotate in one direction. During the return movement of said housing, when the pressure against it is relaxed, the direction. of rotation is automatically reversed. With this arrangement the taps cut screw-threads in the holes in the work very quickly and are removed with equal rapidity.

In swinging the arm 69 about the stud 68 to bring the taps closer together, the lower tap would not remain directly under the upper tap, but would be swung to one side. It is desirable, however, to maintain the taps one directly under the other, as it is more convenient to present the work to the taps under these conditions. By means of the clamps 71, the housing may be released and swung through such an angle about the axis of the supporting arbor as to bring 'said tapsinto vertical alinement, regardless of the relative adjustment of said taps. Said clamps are 'thereafterward clamped upon the flange 70, thereby preventing rotation of the housing due to the friction of the parts. As the housing is swung to various angles, it is necessary to raise or lower the bar'72 in order that said clamps may engage said flange. This adjustment is illus trated somewhat diagrammatically in Fig. 6.

It is obvious that various changes may be. made in the structures described herein without departing from the spirit of the invention, as defined in the appended claims.

What is claimed is: i

1. In a multiple spindle drilling and tapping attachment, the combination with a incense housing, of a pair of spindles therein having teeth out thereon to form pinions, a 'gear mounted between said spindles, a stud on which said gear is mounted, and an arm mounted on said stud, one of said spindlps being carried by said arm, said arm and. said spindle being adjustable longitudinally with relation to said stud.

2. In a multiple spindle attachment, in combination, two rotatable drill carrying spindles, a gear between said spindles and gear is mounted, an arm pivotally mounted on said stud and adjustable radially thereon, and means for clamping said arm inany desired position, one of said drill carryin spindles constituting a driving spindle an the other of said spindles being carried by said arm.

3. In a multiple spindle attachment, the combination with a housing, a pair of spindles therein having teeth cut thereon, a stud supported in said housing, a gear'thereon meshing with the teeth on said spindles, a split arm mounted on said stud and embracing one of said spindles, and means for clamping said split arm in Various positions of adjustment whereby said spindle may also be adjusted with respect to said other spindle.

4. In a multiple spindle attachment, the combination with a housing, a pair of spindles therein having teeth cut thereon, a stud supported in said housing, a gear thereon meshing with the teeth on said spindles, .the teeth on said gear being shorter than the teeth on one of said spindles, whereby the latter may be adjusted longitudinally, a split arm mounted on said stud, said last mentioned spindle being rotatably mounted in said arm and secured against longitudinal movement therein, and means for clamping said split arm in various os'itions of adjustment, both radially an longitudinally of said stud, whereby said spindle may also be adjusted both radially and longitudinally of said gear and hence laterally and longitudinally with respect to said other spindle.

5. In a multiple spindle'attachment, the

" combination with a housing, of a ring secured to the lower end thereof, a projection integral with said ring, a spindle rotatably mounted in said projection, a stud supported in saidhousing, a split arm on said stud, said arm having also a projection thereon, a second spindle passing through said projection, and means for clamping said arm in any radial position, said projection having cut-away faces whereby said spindles may be brought into close proximity. cooperating therewith, a stud. on which said 6. In a'device of the class described, the combination with a housing having a pair of drill carrying spindles, a gear intermediate said spindles and meshing-therewith, one of said spindles driving the other through said gear, of a stationary support to whichsaid housing is secured, means permitting a change in the relative adjustment of said spindles, and means permitting adj ustment of said housing with respect to said support to maintain the original relative arrangement of said spindles with respect to said support. I

'7. In an attachment of the character described, the combination with an adjustable housing having an annular rib thereon, of a pair of spindles rotatably mounted in said housing, an intermediate gear meshing with said spindles, a stationary support, a slide therein, and a clamping member adjustably mounted in said slide whereby it may be clamped over said rib in any position of adjustment of said housing.

8. In a multiple spindle attachment, the combination with a housing, of a pair of drill carrying spindles therein, means permitting a change in the relative adjustment of said spindles, and means whereby said housing may be rotated about an axis coincident with the axis of one of said drill carrying spindles to bring said spindles into JOHN STANLEY S'IIJLIJ. 

